JP6722274B2 - Motorized valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electric valve used in a refrigeration cycle and the like, and a refrigeration cycle system using the electric valve.

Conventionally, a flow control valve used for a large package air conditioner or a refrigerator is known (for example, refer to Patent Document 1). This flow control valve has good operability even when a large diameter and high pressure difference occur due to the rationalization of control equipment such as combining multiple motor-operated valves used for flow control into one. Performance that can be exhibited is desired, but in flow control with a relatively large diameter, the load on the valve body generated by the pressure difference is large against the thrust of the screw generated by the torque of the magnet, and it is large for operating the valve body. Driving force is required.

Therefore, in order to improve the operability of the valve body, a structure as described below is adopted. For example, in the flow rate control valve 101 shown in FIG. 9, the seal member 137 is attached to the valve body 120 that is in sliding contact with the inner peripheral surface of the tubular holding member 114 to define the back pressure chamber 129 above the valve chamber 107. At the same time, the pressure in the valve port 119 is introduced into the back pressure chamber 129 via the passage 124 provided in the valve body 120, and the pressure (back pressure) in the back pressure chamber 129 is used to close the valve. In this state, the force due to the pressure difference between the push-down force (the force acting in the valve closing direction) and the push-up force (the force acting in the valve opening direction) acting on the valve body 120 is canceled to reduce the load on the valve body 120. There is.

In this flow rate control valve, it is necessary to assemble the valve shaft holder 106, the tubular holding member 114, and the valve body 130 with high accuracy in order to prevent valve leakage and improve durability.

JP, 2014-35006, A

By the way, in the above-described flow rate control valve, when the valve shaft holder 106 is assembled to the tubular holding member 114, the flange portion 106f is tubularly held as shown in FIG. 10A (in the circle F in FIG. 9). After engaging with the step portion 114a formed at the upper end of the member 114 to perform centering, the flange portion 106f and the upper end of the tubular holding member 114 are fixed by welding. In this case, in order to secure the concentricity of the valve shaft holder 106 and the tubular holding member 114, high-precision dimensional tolerance is required and also assembly precision is required.

Similarly, when the tubular holding member 114 is assembled to the valve body 130, as shown in FIG. 10B (inside the circle G in FIG. 9), the stepped portion 114b formed on the tubular holding member 114 is closed by the valve. The tubular holding member 114 and the valve main body 130 are fixed by brazing while engaging with the step portion 130a formed in the main body 130 and ensuring airtightness and pressure resistance. Even in this case, in order to secure the concentricity between the tubular holding member 114 and the valve body 130 during assembly, a highly accurate dimensional tolerance is required.
An object of the present invention is to provide an electrically operated valve that can easily secure concentricity between members, and a refrigeration cycle system using the electrically operated valve.

The motor-operated valve of the present invention for achieving the above object,
The rotational motion of the rotor is converted into a linear motion by screw connection between the male screw member and the female screw member,
Based on this linear movement, the valve body housed in the valve body is moved in the axial direction by the guide of the valve body guide member, and a back pressure chamber is provided above the valve body, and a valve port is provided in the back pressure chamber. A motorized valve for introducing internal pressure ,
The female screw member, by contacting a plurality of projections projecting from the outer periphery to the inner peripheral surface of the valve body guide members, are assembled is pressed on the valve body guide member,
The valve body guide member is provided with a step for reducing the outer diameter of the portion of the valve body guide member that comes into contact with the projecting portion than the outer diameter of the rotor side thereof.
A space separated by the step is formed between an outer peripheral surface of a portion of the valve body guide member that comes into contact with the protruding portion and an inner peripheral surface of the valve body located outside thereof. Characterize.
Thereby, when assembling the motor-operated valve, the concentricity between the members can be easily ensured without requiring a high degree of assembly accuracy.

Further, the motor-operated valve of the present invention,
The female screw member is press-fitted into the valve body guide member, and the valve body guide member is press-fitted into the valve body to be assembled.
Accordingly, when assembling the electric valve, the concentricity of the valve body, the valve body guide member, and the female screw member (valve shaft holder) can be easily ensured, and the valve body, the valve body guide member, and the female body can be easily secured. The screw member (valve shaft holder) is positioned and fixed accurately.

Further, the motor-operated valve of the present invention,
A second press-fitting portion having a diameter smaller than that of the first press-fitting portion is formed in the valve body guide member by the first press-fitting portion and the step.
The valve body guide member is assembled to the valve body by press-fitting the first press-fitted portion into the valve body,
It is characterized in that the female screw member is press-fitted into the second press-fitting portion of the valve body guide member and assembled to the valve body.

By thus forming the step in the valve body guide member, a space is formed between the first press-fitting portion and the female screw member (valve shaft holder), and between the second press-fitting portion and the valve body. The valve body guide member can be elastically deformed in the radial direction. Therefore, the valve body guide member and the female screw member (valve shaft holder) can be smoothly press-fitted into the valve body and the motor-operated valve, respectively. Further, by providing a step in the valve body guide member to form a space, even if the valve body guide member or the female screw member (valve shaft holder) is tilted in the process of press-fitting, the valve body guide member does not move in the radial direction. Due to the elastic deformation, the valve body guide member and the female screw member (valve shaft holder) are not assembled while tilted, and the valve body, the valve body guide member, and the female screw member (valve shaft holder) are concentric with each other. Can be accurately secured.

Further, the motor-operated valve of the present invention,
The valve body guide member is a metal component configured separately from the female screw member.
By thus forming the valve body guide member with metal, the slidability of the valve body can be improved.
Further, the refrigeration cycle system of the present invention,
Compressor, condenser, expansion valve, and a refrigeration cycle system including a evaporator, characterized by using an electric valve mentioned above as the expansion valve.

According to the present invention, it is possible to provide an electrically operated valve capable of easily ensuring concentricity between members, and a refrigeration cycle system using the electrically operated valve.

FIG. 3 is a cross-sectional view of the electrically operated valve according to the first embodiment. It is a figure which shows the structure of the valve-shaft holder (female screw member) of the electrically operated valve which concerns on 1st Embodiment. It is a principal part expanded sectional view of the motor operated valve shown in FIG. It is sectional drawing of the electrically operated valve which concerns on 2nd Embodiment. It is a principal part expanded sectional view of the electrically operated valve shown in FIG. It is sectional drawing of the electrically operated valve which concerns on 3rd Embodiment. It is a principal part expanded sectional view of the electrically operated valve shown in FIG. It is sectional drawing of the electrically operated valve which concerns on other embodiment. It is sectional drawing of the conventional flow control valve disclosed by Unexamined-Japanese-Patent No. 2014-35006. It is a principal part expanded sectional view of the conventional flow control valve shown in FIG.

Hereinafter, a motor-operated valve according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a motor-operated valve 2 according to the first embodiment. In this specification, "upper" or "lower" is defined in the state of FIG. That is, the rotor 4 is located above the valve body 17.

In this motor-operated valve 2, the valve body 30 is integrally connected by welding or the like below the opening side of the cylindrical cup-shaped case 60 made of a non-magnetic material.
Here, the valve body 30 is a press-molded product manufactured by pressing a metal material such as a stainless steel plate, and has the valve chamber 11 inside. A first pipe joint 12 made of stainless steel or copper, which directly communicates with the valve chamber 11, is fixedly attached to the valve body 30. Further, a valve seat member 30A in which a valve port 16 having a circular cross section is formed is incorporated inside the valve body 30. A second pipe joint 15 made of stainless steel or copper, which communicates with the valve chamber 11 via the valve port 16, is fixedly attached to the valve seat member 30A.

The rotatable rotor 4 is housed in the inner periphery of the case 60, and the valve shaft 41 is disposed in the axial core portion of the rotor 4 via the bush member 33. The valve shaft 41 and the rotor 4, which are connected by the bush member 33, integrally move in the vertical direction while rotating. A male screw 41a is formed on the outer peripheral surface of the valve shaft 41 near the middle portion. In the present embodiment, the valve shaft 41 functions as a male screw member.

On the outer periphery of the case 60, a stator including a yoke, a bobbin, and a coil (not shown) is arranged, and the rotor 4 and the stator constitute a stepping motor.
A guide support 52 is fixed to the ceiling surface of the case 60. The guide support body 52 has a cylindrical portion 53 and an umbrella-shaped portion 54 formed on the upper end side of the cylindrical portion 53, and is wholly integrally molded by press working. The umbrella-shaped portion 54 is formed into a shape that is substantially the same as the inside of the top of the case 60.

A cylindrical member 65 that also serves as a guide for the valve shaft 41 is fitted in the cylindrical portion 53 of the guide support body 52. The tubular member 65 is made of a material containing a lubricant made of metal or synthetic resin, or a member subjected to surface treatment, and holds the valve shaft 41 rotatably.

Below the bush member 33 of the valve shaft 41, as will be described later, a valve shaft holder 6 that forms a screw connection A with the valve shaft 41 and has a function of suppressing the inclination of the valve shaft 41 is provided. It is fixed so as not to rotate relative to.

FIG. 2 is a view showing the structure of the valve shaft holder 6. Here, FIG. 2A is a side view of the valve shaft holder 6, and FIG. 2B is a top view of the valve shaft holder 6 viewed from above. Further, FIG. 2C is a bottom view of the same viewed from below, and FIG. 2D is a sectional view taken along line AA of FIG. 2B.

As shown in FIG. 2, the valve shaft holder 6 is fitted with an upper tubular small diameter portion 6a, a lower tubular large diameter portion 6b, and a fitting portion 6c housed on the inner peripheral side of the valve body 30. It is a member including a flange portion 6f protruding from the joint portion 6c. Here, the tubular small diameter portion 6a, the tubular large diameter portion 6b, and the fitting portion 6c are made of a resin material such as PPS (polyphenylene sulfide) resin, and the flange portion 6f is made of metal such as stainless steel. Has been formed.

Further, as shown in FIG. 2C, the fitting portion 6c is provided with protruding portions 6c1 protruding in all directions on the outer circumference. Further, the maximum outer diameter of the fitting portion 6c formed by the outer wall surface of the protruding portion 6c1 is formed so as not to be smaller than the diameter on the inner peripheral surface side of the valve body 30. Therefore, when the valve shaft holder 6 is press-fitted into the valve body guide member 72, the protruding portion 6c1 of the valve shaft holder 6 can be tightly locked to the inner peripheral surface of the large diameter portion 72a of the valve body guide member 72, It is possible to prevent the valve shaft holder 6 from moving with respect to the valve body guide member 72. The flange portion 6f has a ring shape surrounding the lower end of the cylindrical large diameter portion 6b.

A female screw 6d is formed downward from the upper opening 6g of the tubular small-diameter portion 6a of the valve shaft holder 6 to a predetermined depth. Therefore, in this embodiment, the valve shaft holder 6 functions as a female screw member. The male screw 41a formed on the outer periphery of the valve shaft 41 and the female screw 6d formed on the inner periphery of the cylindrical small-diameter portion 6a of the valve shaft holder 6 constitute the screw connection A shown in FIG. There is.

Further, a storage chamber 6h for storing the valve guide 18 is formed inside the valve shaft holder 6. Further, a pressure equalizing hole 51 is formed in the side surface of the cylindrical large diameter portion 6b of the valve shaft holder 6, and the valve in the cylindrical large diameter portion 6b is formed by the pressure equalizing hole 51 as shown in FIG. The shaft holder chamber 83 and the rotor accommodating chamber 67 (second back pressure chamber) communicate with each other. By providing the pressure equalizing hole 51 in this manner, the space for housing the rotor 4 of the case 60 and the space in the valve shaft holder 6 are communicated with each other, so that the valve shaft holder 6 can be smoothly moved. it can.

Further, below the valve shaft 41, a tubular valve guide 18 is disposed so as to be slidable with respect to the accommodation chamber 6h of the valve shaft holder 6. The valve guide 18 has a ceiling portion 21 side bent by press molding at a substantially right angle. A through hole 18a is formed in the ceiling portion 21. Further, below the valve shaft 41, a collar portion 41b is formed.

Here, the valve shaft 41 is inserted in the through hole 18a of the valve guide 18 in a freely penetrating state so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction. It is arranged in the valve guide 18 so as to be rotatable and radially displaceable with respect to the guide 18. Further, the valve shaft 41 is inserted through the through hole 18 a, and the upper surface of the collar portion 41 b is arranged so as to face the ceiling portion 21 of the valve guide 18. The flange 41b has a larger diameter than the through hole 18a of the valve guide 18, so that the valve shaft 41 is prevented from coming off.

Since the valve shaft 41 and the valve guide 18 are movable in the radial direction with respect to each other, the valve guide 18 and the valve guide 18 are not required to have high concentric mounting accuracy with respect to the arrangement positions of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 is obtained.

A washer 70 having a through hole formed in the central portion is provided between the ceiling portion 21 of the valve guide 18 and the flange portion 41b of the valve shaft 41. The washer 70 is preferably a metal washer with a highly slippery surface, a highly slippery resin washer such as a fluororesin, or a metallic washer with a highly slippery resin coating.
Further, a compressed valve spring 27 and a spring receiver 35 are accommodated in the valve guide 18.

A valve body guide member 72 that guides the axial movement of the valve body 17 is disposed inside the valve body 30, and a seal member 48 is provided between the valve body 17 and the valve body guide member 72. It is installed.
Here, in the valve body 17, a vertical hole portion 17b and a horizontal conductive hole 17c are formed as a pressure equalizing path. The pressure in the valve port 16 (inside the second pipe joint 15) is guided to the back pressure chamber 28 via the hole portion 17b, which is a pressure equalizing passage, and the conduction hole 17c.

The valve body guide member 72 is a metal cylindrical body that penetrates the inside, and has a flange portion 72c located at the uppermost position, a large diameter portion 72a below the flange portion 72c, and a small diameter portion 72b below the flange portion 72c. It is formed by press forming a metal material such as a stainless steel plate. The diameter of the large diameter portion 72a of the valve body guide member 72 on the outer peripheral surface side is slightly larger than the diameter on the inner peripheral surface side of the valve body 30. Therefore, when the valve body guide member 72 is press-fitted into the valve body 30, the large diameter portion 72a of the valve body guide member 72 can be tightly locked to the inner peripheral surface of the valve body 30, and the valve body guide member 72 It can be prevented from moving relative to the valve body 30.

It should be noted that the valve body guide member 72 may be formed integrally with the valve shaft holder 6 instead of being an independent component, but in the present embodiment, the valve body guide member 72 is different from the valve shaft holder 6. The case where the parts are independent will be described as an example.

The seal member 48 is an annular member formed by sandwiching an annular reinforcing plate 48b between annular packings 48a having a L-shaped cross section and made of a highly slippery resin material such as PTFE. In addition, in the seal member 48, a leaf spring that constantly biases the annular packing 48a outward is disposed above the annular packing 48a that is disposed above and below the annular packing 48a that is disposed below. Is preferred.

Next, a main part of the motor-operated valve 2 according to the first embodiment will be described. FIG. 3 is an enlarged cross-sectional view of a main part of the motor-operated valve 2 according to the first embodiment. As shown in FIG. 3, in the motor-operated valve 2, the valve shaft holder 6, the valve body guide member 72, and the valve body 30 are composed of independent members.

Here, when assembling the motor-operated valve 2, first, the valve body guide member 72 is press-fitted into the valve body 30 with the outer peripheral surface of the large diameter portion 72 a contacting the inner peripheral surface of the valve body 30. Further, the valve shaft holder 6 is press-fitted into the valve body guide member 72 by bringing the protruding portion 6c1 protruding from the outer periphery of the fitting portion 6c into contact with the inner peripheral surface of the large diameter portion 72a of the valve body guide member 72. After the press-fitting, the lower surface of the flange portion 6f of the valve shaft holder 6, the upper end portion of the valve body 30, and the flange portion 72c of the valve body guide member 72 are integrally welded to be sealed over the entire circumference. Fixed.

As described above, when the outer peripheral surface of the large diameter portion 72a of the valve body guide member 72 is brought into contact with the inner peripheral surface of the valve body 30 to press the valve body guide member 72 into the valve body 30, the valve body guide member 72 is Since the valve body guide member 72 can be tightly locked to the valve body 30, the valve body guide member 72 is naturally arranged at a position concentric with the valve body 30. Similarly, when the protrusion 6 c 1 of the valve shaft holder 6 is brought into contact with the inner peripheral surface of the large diameter portion 72 a of the valve body guide member 72 to press the valve shaft holder 6 into the valve body guide member 72, the valve shaft holder 6 Since the protrusion 6c1 can be tightly locked to the valve body guide member 72, the valve shaft holder 6 is naturally arranged at a position concentric with the valve body guide member 72.

Therefore, according to the invention according to the first embodiment, when the motor-operated valve 2 is assembled, the valve body 30, the valve body guide member 72, and the valve shaft holder 6 can be easily assembled without a high degree of assembly accuracy. The concentricity can be ensured, and the valve body 30, the valve body guide member 72, and the valve shaft holder 6 can be accurately positioned and fixed. Therefore, it is not necessary to use a jig or the like to secure the concentricity. In addition, by tightly locking the valve body guide member 72, the first chamber 26 formed outside the valve body 17 and the spine formed by the valve body 17 and the valve shaft holder 6 are formed. Since the space between the pressure chamber 28 and the pressure chamber 28 is reliably sealed, pressure leakage between the first chamber 26 and the back pressure chamber 28 can be prevented. Further, since the valve body guide member 72 is made of metal and the annular packing 48a of the seal member 48 is made of a highly slippery resin material such as PTFE, the slidability of the valve body 17 can be improved.

Next, a motor operated valve according to a second embodiment will be described with reference to the drawings. The motor-operated valve according to the second embodiment is obtained by directly press-fitting the valve shaft holder 6 into the valve body 30 in the first embodiment. Therefore, description of the same configuration as that of the first embodiment will be omitted, and only different portions will be described.

FIG. 4 is a cross-sectional view of the motor-operated valve according to the second embodiment, and FIG. 5 is a cross-sectional view in which a main part thereof is enlarged. As shown in FIG. 4, the valve shaft holder 6 is formed so that the maximum outer diameter of the fitting portion 6c formed by the outer wall surface of the protruding portion 6c1 does not become smaller than the diameter on the inner peripheral surface side of the valve body 30. ing. Therefore, when the valve shaft holder 6 is press-fitted into the valve body 30, the protruding portion 6c1 of the valve shaft holder 6 can be tightly locked to the inner peripheral surface of the valve body 30, and the valve shaft holder 6 can be attached to the valve body 30. You can prevent it from moving.

The valve body guide member 72 has a large diameter portion 72a and a small diameter portion 72b below the large diameter portion 72a, and the diameter of the large diameter portion 72a of the valve body guiding member 72 on the outer peripheral surface side is the inner circumference of the valve body 30. It is formed slightly larger than the diameter on the surface side. The valve element guide member 72 used in the motor-operated valve 200 according to the second embodiment does not include the flange portion 72c (see FIG. 1) unlike the motor-operated valve 2 according to the first embodiment. .. The valve element guide member 72 is attached below the valve shaft holder 6 by welding the large diameter portion 72a to the inner peripheral surface of the valve body 30.

Here, when assembling the motor-operated valve 200, as shown in FIG. 5, the valve shaft holder 6 makes the protruding portion 6c1 of the fitting portion 6c of the valve shaft holder 6 directly contact the inner peripheral surface of the valve body 30. Is press-fitted into the valve body 30. After the press-fitting, the lower surface of the flange portion 6f of the valve shaft holder 6 and the upper end portion of the valve body 30 are integrally welded and fixed in a sealed state over the entire circumference.

As described above, when the protrusion 6c1 of the valve shaft holder 6 is brought into direct contact with the inner peripheral surface of the valve body 30 to press the valve shaft holder 6 into the valve body guide member 72, the protrusion 6c1 of the valve shaft holder 6 is Since the valve shaft holder 6 is tightly locked to the valve body 30, the valve shaft holder 6 is naturally arranged at a position where it is concentric with the valve body 30.

According to the second embodiment of the invention, when assembling the motor-operated valve 200, the concentricity of the valve body 30 and the valve shaft holder 6 can be easily ensured without requiring a high degree of assembly accuracy. As a result, the valve body 30 and the valve shaft holder 6 are reliably positioned and fixed.

Next, a motor operated valve according to a third embodiment will be described with reference to the drawings. The motor-operated valve according to the third embodiment has the valve body guide member 72 provided with a step in the first embodiment. Therefore, description of the same configuration as that of the first embodiment will be omitted, and only different portions will be described.

FIG. 6 is a cross-sectional view of the electrically operated valve according to the third embodiment. As shown in FIG. 6, the valve body guide member 72 includes a large diameter portion 72a, a lower small diameter portion 72b, and a flange portion 72c. A step 74 is formed on the large diameter portion 72a over the entire circumference. FIG. 7 is an enlarged cross-sectional view of the vicinity of the step 74 that is the main part of the motor-operated valve 202. As shown in FIG. 7, the large-diameter portion 72 a of the valve body guide member 72 is configured such that the diameter changes at the step 74, and the first press-fitting portion 75 formed above the step 74 and the step 74 below. The second press-fitting portion 76 having a diameter smaller than that of the first press-fitting portion 75 formed in the above. By forming the step 74 in the large-diameter portion 72a of the valve body guide member 72 in this manner, a space 82 is formed between the first press-fitting portion 75 and the valve shaft holder 6, and the second press-fitting portion 76 is formed. A space 84 is formed between the valve body 30 and the valve body 30. Therefore, the valve body guide member 72 can be elastically deformed in the radial direction.

Further, the diameter of the first press-fitting portion 75 on the outer peripheral surface side is formed to be slightly larger than the diameter of the valve body 30 on the inner peripheral surface side. The portion 75 is tightly locked to the inner peripheral surface of the valve body 30. Similarly, the maximum outer diameter of the fitting portion 6c of the valve shaft holder 6 formed by the outer wall surface of the protruding portion 6c1 is formed so as not to be smaller than the diameter of the second press-fitting portion 76 on the inner peripheral surface side. Therefore, when the valve shaft holder 6 is press-fitted into the valve body guide member 72, the protruding portion 6c1 of the valve shaft holder 6 is tightly locked to the inner peripheral surface of the second press-fitted portion 76.

Here, when assembling the motor-operated valve 202, the valve body guide member 72 is press-fitted into the valve body 30 by bringing the inner peripheral surface of the valve body 30 into contact with the outer peripheral surface of the first press-fitting portion 75 of the large diameter portion 72a. .. In this case, since the space 82 is formed between the first press-fitting portion 75 and the valve shaft holder 6, the first press-fitting portion 75 can be radially contracted by the reaction force of the inner peripheral surface of the valve body 30. As compared with the case where the valve body guide member 72 has no step 74, the valve body guide member 72 is smoothly press-fitted into the valve body 30.

Further, in the valve shaft holder 6, the protruding portion 6c1 protruding from the outer periphery of the fitting portion 6c is brought into contact with the inner peripheral surface of the second press-fitting portion 76 of the large diameter portion 72a of the valve body guiding member 72, so that the valve body guiding member 72. Is pressed into. In this case, since the space 84 is formed between the second press-fitting portion 76 and the valve body 30, the second press-fitting portion 76 can be expanded in the radial direction by the protrusion 6c1 of the valve shaft holder 6, and the valve shaft The holder 6 is smoothly pressed into the valve element guide member 72.

After the press-fitting, the lower surface of the flange portion 6f of the valve shaft holder 6, the upper end portion of the valve body 30, and the flange portion 72c of the valve body guide member 72 are integrally welded to be sealed over the entire circumference. Fixed.

According to the invention of the third embodiment, the large diameter portion 72a is provided with the step 74 to form the space 82 and the space 84, and the valve body guide member 72 can be elastically deformed in the radial direction. As a result, the valve body guide member 72 and the valve shaft holder 6 can be smoothly press-fitted into the valve body 30 and the motor-operated valve 202 can be easily assembled. Further, by providing the space 82 and the space 84 formed by the step 74 on both sides of the valve body guide member 72, even if the valve body guide member 72 and the valve shaft holder 6 are inclined during the press-fitting process, the valve body is inclined. Since the guide member 72 is elastically deformed in the radial direction, the valve body guide member 72 and the valve shaft holder 6 are not assembled while being tilted, and the valve body 30, the valve body guide member 72, and the valve shaft holder 6 are the same. The coreness can be accurately ensured.

In each of the above-described embodiments, the case where the hole portion 17b and the conduction hole 17c are provided in the valve body 17 as the pressure equalizing path has been described as an example, but the pressure equalizing path is not necessarily provided in the valve element 17. It need not be provided. For example, instead of providing the pressure equalizing passage in the valve body 17, a piping member for guiding the pressure of the valve port 16 to the back pressure chamber 28 may be separately arranged.
Further, in each of the above-described embodiments, the case where the annular member formed by sandwiching the annular reinforcing plate 48b between the annular packings 48a having an L-shaped cross section is used as the seal member 48 is described as an example. However, the structure of the seal member 48 is not necessarily limited to this. For example, as shown in FIG. 8, as the seal member 48, a composite seal material in which an O-ring 48d and an annular packing 48f having a C-shaped cross section made of a highly slippery resin material such as PTFE may be used.
The motor-operated valve of each of the above-described embodiments is used as an expansion valve provided between a condenser and an evaporator in a refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator, and the like. To be

2 Motorized valve 6 Valve shaft holder (female screw member)
6c Fitting portion 6c1 Projection portion 6d Female screw 17 Valve body 30 Valve body 41 Valve shaft 41a Male screw 48 Seal member 72 Valve body guide member 72a Large diameter portion 72b Small diameter portion 72c Flange portion 74 Step 75 First press fitting portion 76 Second Press fit part 82 Space 84 Space

Claims (5)

The rotary motion of the rotor is converted into a linear motion by the screw connection between the male screw member and the female screw member, and the valve body accommodated in the valve body is axially guided by the guide of the valve body guide member based on the linear motion. While moving, an electric valve which provides a back pressure chamber on the upper side of the valve body and introduces the pressure in the valve port into the back pressure chamber ,
The female screw member, by contacting a plurality of projections projecting from the outer periphery to the inner peripheral surface of the valve body guide members, are assembled is pressed on the valve body guide member,
The valve body guide member is provided with a step for reducing the outer diameter of the portion of the valve body guide member that comes into contact with the projecting portion than the outer diameter of the rotor side thereof.
A space separated by the step is formed between an outer peripheral surface of a portion of the valve body guide member that comes into contact with the protruding portion and an inner peripheral surface of the valve body located outside thereof. A characteristic motorized valve. The electrically operated valve according to claim 1, wherein the female screw member is press-fitted into the valve body guide member, and the valve body guide member is press-fitted into the valve body to be assembled. A second press-fitting portion having a diameter smaller than that of the first press-fitting portion is formed in the valve body guide member by the first press-fitting portion and the step.
The valve body guide member is assembled to the valve body by press-fitting the first press-fitted portion into the valve body,
The electrically operated valve according to claim 2, wherein the female screw member is press-fitted into the second press-fitting portion of the valve body guide member and assembled to the valve body. The motor-operated valve according to any one of claims 1 to 3, wherein the valve body guide member is a metal component configured separately from the female screw member. Compressor, a condenser, a refrigeration cycle system including expansion valve, and an evaporator, the refrigeration cycle system, which comprises using the electric valve according to claim 1 as said expansion valve ..

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